Method of protecting metal, wood, and other substances and objects so protected



45 other fashioning of them Patented my 9, 1929.

PATENT OFFICE.

7 JAMES ROBINSON HATIAKER, OI PARIS, FRANCE.

METHOD OF PROTECT DIG METAL,

Io Drawing. Application flied November 19,

WOOD, AND OTHER SUBSTANCES AND OBJECTS SO PROTECTED. I

1927, Serial 1%. 234,550, and in Great Iovember It has been proposed to protect metal, wood and other substances from the injurious effects of the atmosphere and of water and other li aids and gases by coating them with 5 a suitab e rotective composition and then envelopin t em completely with a thin woven materia or other suitable textile fabric of fairly open weave, by wetting or moistening the same and allowing shrinking to take place in situ, after which the whole is painted agam and allowed to'dry, but it has been found that if ordin'ar iron sheets such as are common corrugate and used for roofing and other purposes are thus coated and enveloped-even when strong cloth of jute is employed as the covering material-that they "cannot be passed through an ordinary roller corrugat- 1ng mill and corrugated without breaking or cracking the protection and seriously in uring it. And serious cracks have occurred when such sheets so protected havebeen fashionpd by stamping t em in an ordinary stamp mil I have discovered that if such ordinary iron sheets are covered snugly with a suitable knitted fibrous covering, such as cotton thread knit in the-form of tubing, and such covering is impregnated with a suitable protective composition, they can be corrugated in an ordinary roller corrugating mill without breaking or cracking the protection and that sheets so treated will withstand severe strains remarkab lfilwell bent, pressed or stamped.

' e continuous looping of threads in the process of knitting gives a product which is particularly suitable for the purpose specified and which is able successfully to withstand the strains of rolling, pressing or stamping to a much greater degree than the same threads 40 woven into cloth. and shrunk in situ as has. been proposed, and the use of such knitted fi-' brousmaterial for enveloping iron sheets, as described, makes possible the practical corrugation of them in an ordinar roller mill, or y pressing or stampingresults which have not hitherto been successfully accomplished.

The use of knitted material, in connection with the method described, has other practical advantages over woven material however the latter may be applied. For example, it is easy to knit cotton or other fibrous threads in continuous circles to form a hollow tubing of knitted material. And it is easy to stretch such a tube sidewise and slip it over a sheet of metal or other object, and then release it and allow it to contract into position on the same. Then, if the tubing is of the proper size, it will cover the sheet snugly like a stocking. The tubing may be immersed in the protective composition before it is thus applied to the sheet or object and applied wet, or it may be applied dry and then impregnated with the compositon. Such tubing being very elastic covers the sheet uniformly on both sides, without having to be wet and shrunk in situ; and its use avoids the lap or seam lengthwise of the sheet which occurs when it is wrapped with a piece of cloth-and its endsmay be closed by sewing. A much better a pearance is obtained with the knitted materi referred to than with cloth forming a lap or joint lengthwise, and a wider use of the finished ing for iron roofing sheets th are to be protected as described and then corrugated in a.

roller mill.

To meet various 1' uirements the tubing may be knit more or ess open and with a greater or less number of threads or needles, and I do not limit my invention to ap licat1ons on metal sheets to be corrugate in a roller mill for it may be used with success, in many cases, on metal sheets or plates and on other objects that are to be pressed, stamped .or otherwise fashioned after they have been protected as described.

The use of fibrous material knitted in the form of tubing is particularly advanta us incovering pipe, rods, posts and other 0 jects to be protected as described and to which it can be applied, whether such objects are to be exposed to particular strain or not and my invention covers such use.

The protective compositio s referred to in British patent specification No. 272,142 are good examples of suitable protective compositions.

I claim:

1. The method of protecting wood, iron and other substances from the injurious effects of the atmospherewand of water and material knitted in the form of tubing and in them impregnating that covering with a suitable protective composition.

2. The method of protecting metal sheets or plates and other objects which are to be rolled, stamped or otherwise fashioned, from the effects of the atmosphere and of water and other liquids and gases which consists in covering them snugly with suitable fibrous material knitted in the form of tubing and in impregnating that covering with a suitable )rotective composition before they are rolle stamped or otherwise fashioned.

3. The method of protecting iron sheets which are to be corrugated by corrugating means, from the efiects ot' the atmosphere and of water and other liquids and gases which consists in covering them snugly and completely with suitable fibrous material knitted in the form of tubing and in impregnating that covering with a suitable protective composition and allowing it to properly set and in then corrugating them by corrugating means.

4. Corrugated iron sheets protected from the effects of the atmosphere and of water and other liquids and gases by acovering of suitable, snugly-fitting fibrous material knitted in the form of tubing and impregnated with a suitable protective composition.

5. Pipes, rods, posts and other elongated objects protected from the effects of the atmosphere and of water and other liquids and gases by a covering of suitable, snugly-fitting, fibrous, tubular-knitted material impregnated with a suitable protective composition.

JAMES R. HATMAKER. 

